| 摘要 |
A parallel type switching power source circuit wherein reliable energization is achieved by individual power source switches provided for power source units, without common start-up switch, is provided. The start-up signal input terminals I1 and I2 and the drive stop signal input terminals R1 and R2 of power source units 12, 22 become active when they are connected to the negative side of an input power source 31. The power source unit 12 (or 22) starts only if the start-up signal input terminal I1 (or I2), is active and the drive stop signal input terminal R1 (or R2) is non-active. When the power source switch 16 is turned on at first, I1 becomes active, while R1 retains in active. Then the start-up condition is not satisfied and both of the first and second switching power sources 15 and 25 do not start. When the power source switch 26 is turned on next, I2 becomes active and both of R1 and R2 become non-active. This causes a start-up condition to be arranged, and then the switching power sources 15 and 25 start simultaneously.
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